1. Astronomy Division, Aryabhatta Research Institute of observational sciencES (ARIES) , Nainital 263001, India
2. Deen Dayal Upadhyaya Gorakhpur University , Gorakhpur 273009, India
3. Indian Institute of Astrophysics (IIA) , Koramangala, Bangalore 560034, India
4. Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK